There is a 3rd alternative...
Atolia, the one and only workspace your team needs
Atolia is a power-packed all-in-one digital workplace: Chat, Video calls, Tasks & Projects, Calendars, Documents, Notes...
Accelerate your team's collaboration game.
Implement it in minutes and save money. Atolia is cheaper than most of the business instant messaging apps.
Why choose Mattermost or Wimi?
Both platforms offer chat and file sharing, but Mattermost has more features such as mentions, threads, and 1-1 video calls. Wimi, on the other hand, offers online document editing, document viewer, and document management. Mattermost has unlimited storage while Wimi offers storage from 25GB to 50TB. Both platforms provide help resources and mobile, web, and desktop apps, but Mattermost also offers on-premise deployment and end-to-end encryption. Overall, Mattermost seems to be more suited for tech-focused teams while Wimi offers a broader range of collaboration features.